Yorkville Sound CA12 owner manual Rear Panel

C O L I S E U M

Rear Panel				which helps reduce the level of accidental loud
				noises and clipping distortion for each Zone
4. Bus Inputs				(both channels of each Zone).
RCA connectors and a screw terminal strip are				10. Stereo/Bridge Button
provided to connect your mixer, stereo tuner/preamp,
						For stereo, or dual-zone mono operation,
CD player or other audio media device.
						at 50 Watts per channel leave this in the
				4
Note: use only one type of source.						up position. To combine (i.e. Bridge) the
5. Bus Outputs						two into a 110-Watt mono amplifier,
							depress the button. In Bridge
These RCA connectors are simply							mode, the +4 ohm / +70V button
in parallel with the Bus Inputs and							must be in the +4 ohm position
enable you to interconnect the CA12							(depressed) to allow for the 8-
with another CA12 or amplifier.							ohm speaker circuit, not 4-ohms!
Note: only the Input Bus signals							In bridge mode, an amplifier
							encounters a load that is about
will be patched to Output.
							one half of its actual value – a
The Following Applies to Each
							4-ohm load would therefore be
One of the Zone Input Sections							2-ohms to a bridged amp and if
6. Ch Line Input							the amplifier isn’t designed to run
							safely into such a low impedance
These inputs allow connection of
							(which the CA12 is not) damage
sources directly to the individual
							may occur to the amplifier. We
channels. This input allows stereo,
							do not recommend connecting a
line-level source or two separate
							70V speaker circuit while in Bridge
mono audio sources. If you Bridge				5
						mode as the output will be at 140V
the Zone’s pair of amplifiers into an 8-ohm
						and the sound can be distorted.
speaker circuit, use the Left input and connect a
mono source.				11. +4 ohm / 70V Button
7. Line/Bus Button				Leave this switch in the up position if you are
				connecting 4-ohm or 8-ohm speaker circuit
Each Zone’s input source can be selected
				(Stereo mode). Depress the button to connect a
using this switch. Depress the button to select
				70V speaker circuit.
the audio program coming from the Bus
Input or leave it in the up position to use		12		12. Speaker Connections
the Zone’s Line Input.				Insert bare wire ends here and tighten the
8. Remote Volume Jack						retaining screws to secure properly.
						For a stereo Zone or dual mono
Using a cable terminated with a
						Zones, connect the + and – system
¼-inch mono phone plug, connect
						leads from each Zone to one +4 ohm
your DC remote volume control
						and its adjacent – Neg terminal in the
source (a potentiometer for example)
						L & R terminal groupings. In Bridge
here. When connected, this feature
						mode, connect the + and – leads
bypasses both front panel
						from an 8-ohm speaker circuit (not
controls for this Zone.
	11					4-ohms – see Stereo/Bridge Button
9. Limiter In/Out Button
								section above) to each of the
The Limiter In/Out	10						6	+4 ohm terminals.
button activates a
pre-set input limiter,
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